Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Ventilation was interrupted in a 2000-head nursery building, and air temperature and carbon dioxide levels were measured. Tests were conducted in two rooms, one with 6.8 kg (15 lbs.) pigs and the other with 22.7 kg (50 lbs.) pigs. In the room with the 22.7 kg (50 lbs.) pigs, two tests were conducted, one without any ventilation on and the second with only mixing fans on.

In the test with the 6.8 kg (15 lbs.) pigs and no ventilation running, carbon dioxide would be expected to affect the pigs within 150 minutes. Temperature would never reach a critical level. With the 22.7 kg (50 lbs.) pigs and no ventilation running, the critical time would be about 60 minutes because of temperature. Carbon dioxide would affect the pigs within 95 minutes. With the mixing fans on, the critical time for the same animals would be 75 minutes for temperature and 115 minutes for carbon dioxide. These tests may help predict animal mortality and assist in designing backup systems for confinement ventilation. (Download PDF)    (Export to EndNotes)